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Obtaining Outlook 2007

We're having a hard time finding a place to purchase a stand-alone MS Outlook 2007 license.
I remember seeing this available before, but apparently with the release of Office 2010, you can no longer purchase stand-alone Outlook 2007 through normal retail channels.
Does anybody know if Outlook 2010 will work? If not, maybe somebody could post some links to some options for purchasing stand-alone Outlook 2007.